checkpointserver.c

Path MPICH-V for MPICH the MPI Implementation

/*
  MPICH-V2
  Copyright (C) 2002, 2003 Groupe Cluster et Grid, LRI, Universite de Paris Sud


  This file is part of MPICH-V2.

  MPICH-V2 is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  MPICH-V2 is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with MPICH-V2; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  $Id: checkpointServer.c,v 1.6 2006/01/18 18:09:35 rodrigue Exp $
*/
/*  Programme serveur de checkpoint
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/utsname.h>
#include <arpa/inet.h>

#include "config.h"
#include "debug.h"

#include "checkpointServerError.h"
#include "checkpointServerProto.h"
#include "checkpointServerFile.h"

#include "server.h"


static char idFile[4096];

static void on_sigchld(int s)
{
   while( waitpid(-1, NULL, WNOHANG) > 0) /* nothing */ ;
   signal(SIGCHLD, on_sigchld);
}

int main(int argc, char *argv[]) {
  int se;
  int sproto;
  int sdata;
  struct sockaddr_in addr;
  socklen_t saddr;
  struct hostent *he;
  struct utsname nodename;
  int socketToDispatcher;
  struct gengetopt_args_info *args;
  char *chkptpath = NULL;

  signal(SIGCHLD, on_sigchld);
	
  if(uname(&nodename) < 0) qerror("Cannot get localhost name");
  sprintf(idFile, "CS(%s)", nodename.nodename);

  args = initialize_mpichv_service(idFile, argc, argv, &socketToDispatcher,
				   &se);

  if(args == NULL)
    exit(1);

  printi("CS_init","Checkpoint server launched");

  chkptpath = args->tmp_dir_arg;
  if(!chkptpath) chkptpath = CKPT_REPOSITORY_PATH;

  

  if(chdir(chkptpath) == -1) 
    qerror("chdir to chkptfiles directory %s", chkptpath);

  while(1)
  {
    saddr = sizeof(addr);
    if((sproto = accept(se, (struct sockaddr *)&addr, &saddr)) == -1) 
      qerror("accept");
    if((he = gethostbyaddr(&addr.sin_addr,sizeof(addr.sin_addr),AF_INET)) == NULL) herror("gethostbyaddr");
    printi("CS_accept", "Client %s proto connection accepted", he->h_name);

    switch(fork())
    {
      case -1 : qerror("fork");
      case 0 :
        close(se);
        /* second part socket */
        if((se = socket(AF_INET,SOCK_STREAM,0)) == -1) qerror("socket");
        saddr = sizeof(addr);
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = INADDR_ANY;
        addr.sin_port = htons(0);
        printi("CS_accept", "Binding data server for %s (%s) to mandatory port", he->h_name, inet_ntoa(addr.sin_addr));
        if(bind(se,(struct sockaddr *)&addr,sizeof(addr)) == -1) qerror("bind");
        if(listen(se,5) == -1) qerror("listen");
        if(getsockname(se , (struct sockaddr *) &addr, &saddr) < 0) qerror("getsockname failed, aborting");
        printi("CS_accept", "Bound data server for %s to port %d", he->h_name, ntohs(addr.sin_port));
        if(write(sproto, &(addr.sin_port), sizeof(in_port_t)) != sizeof(in_port_t))
        {
          printw("Client %s crashed during connect transaction", he->h_name);
          close(sproto);
          close(se);
          exit(-1);
        }
        saddr = sizeof(addr);
        if((sdata = accept(se,(struct sockaddr *)&addr,&saddr)) == -1) qerror("accept");
        printi("CS_accept", "Client %s data connection accepted", he->h_name);
        traiter_message(sproto, sdata);
        exit(0);
      default :
        close(sproto);
        while(waitpid(-1,NULL,WNOHANG) > 0);
    }
  }
}